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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22c697c7cf7937c3ffba07bf8658b4c8e9dcc259d30c52c1fcd2763c3b17047e' 
  AND token = '9dnLbvZ6Skql33JKOWYmW6g2tCv6cRih3b4UKrCokoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}